Looms for weaving



June 19, 1956 l. s. PORTER 2,75,65

LOOMS FOR WEAVING Filed Aug. 25, 1952 4 Sheets-Sheet 1 F/GE INVENTORATTORNEYS June 19, 1956 l. S. PORTER LOOMS FOR WEAVING 4 Sheets-Sheet 2Filed Aug. 25, 1952 in .c

I| I l NVENTOR lam WWW ymkh ATTORNEYS June 19, 1956 x. s. PORTER2,759,965

LOOMS FOR WEAVING Filed Aug. 25, 1952 4 Sheet-Sheet 5 INVENTOR ATTORNEYSJune 19, 1956 SQPORTEIR 2,750,965

LOOMS FOR WEAVING Filed Aug. 25, 1952 4 Sheets-Sheet 4 6 r 3 9 a) 2 LL AFNVENTOR m ATTORNEYS LOOMS FOR WEAVING Ian Stephen Porter, Barnsley,England Application August 25, 1952, Serial No. 306,248

2 Claims. (Cl. 13942) This invention relates to an improved motion forthe insertion and withdrawal of the pile wires used in looms for weavingplushes, moquettes, carpets and similar pile fabrics.

In a normal loom for such purpose a wire is inserted at one pick andanother wire withdrawn on the second pick and the cycle is then repeatedand the motion forming the invention is suitable for such a cycle. Incertain weaves however, a cycle of three, four or more picks may berequired and the motion can be made applicable to such a cycle by theintroduction of suitable gearing.

In looms of the kind to which the invention relates it is desirable toinsert and withdraw the wires at varying speeds depending on the speedof the loom and the fabric being woven and the motion forming theinvention allows of such varying speeds being obtained.

According to the present invention one end of an arm, hereinafterreferred to as the epicyclic driving ram, is secured on a driving shafte. g. the tappet shaft of the loom and the other end of the arm carriesa short shaft or pin rotatably mounted therein; the short shaft or pincarries a sprocket wheel which is in alignment with a stationarysprocket wheel co-axial with the driving shaft, the two Wheels beingconnected by a chain, a second arm, hereinafter referred to as thedriven arm, is also secured at one end on the short shaft or pin, theepicyclic driving arm and the driven arm being of the same length, andthe other end of the driven arm carries two pulleys forming the meansfor imparting the desired movement to the pile wire hopper or slide, theratio of the gearing between the two sprocket wheels being such that asthe epicyclic driving arm rotates, the free end of the driven arm andconsequently the pulleys thereon are constrained to move with a straightline movement.

The invention is illustrated in and will be described with reference tothe accompanying drawings, in which:

Fig. l is a perspective view of the side of a loom showing the inventionapplied thereto,

Fig. 2 is a side elevation,

Fig. 3 is a plan partly in section on line 3-3 of Fig. 2,

Fig. 4 is a diagrammatic view of the cord driving the pile wire hop eror slide,

Fig. 5 is a sectional plan of the epicyclic drive, and

Fig. 6 is a section on line 6-6 of Fig. 2.

The apicyclic driving arm A is secured on the tappet shaft or otherrotating shaft of the loom, hereinafter called the driving shaft A Thearm A carries at its free end a short shaft B rotatably mounted inbearings. The short shaft B extends beyond both sides of the epicyclicdriving arm A and at one end carries a sprocket wheel C which is inalignment with a fixed sprocket wheel C coaxial with the driving shaft.The two sprocket wheels C and C are connected by a chain D which istensioned by a jockey wheel d the axle d of which is mounted in a slot ain a lateral extension of the epicyclic driving arm A. The other end ofthe short shaft B carries the driven arm E in the free end of which ismounted a short shaft F carrying two pulleys F F nited States PatentThus, as the epicyclic driving arm A rotates a rotary movement isimparted to the sprocket wheel C carried by the arm relative to thelatter owing to the wheel being connected to the stationary sprocketwheel C by the chain D and the gear ratio of the two sprocket wheels Cand C is such that as the first wheel rotates about the axis of thedriving shaft its rotation about its own axis will be such as to imparta straight line movement to the free end of the arm E and consequentlyto the pulleys F and F to transmit the requisite motion to the wirehopper or slide G which inserts and withdraws the wires from the fabricbeing woven.

To transmit this motion a cord or cable H is fixed at one end to astationary point it on the frame of the loom, passes around the pulley Fcarried by the driven arm E and over two fixed guide pulleys h and W,and is secured at the other end to one end of the wire hopper or slideG. A second cord or cable H is fixed at one end to a stationary point hpasses around the second pulley F carried by the driven arm E and overthree further fixed guide pulleys h h h and is secured at the other endto the opposite end of the hopper or slide G to that at which the cordor cable H is attached. Instead of employing two cords or cables H and Ha single cord affixed to the slide G may be employed.

The stationary points h and h to which the cords or cables H and H areafiixed are so located that when the pulleys F 1 and F carried by thedriven arm E are moved linearly in one direction by the epicyclicdriving arm A, the hopper or slide G is moved in one direction and whenthe pulleys F and F are moved in the opposite direction the hopper orslide is also moved in the opposite direction.

The equivalent of a dwell at each end of the movement of the pile wirehopper or slide G may be obtained by increasing the distance moved bythe hopper or slide at each end beyond the normal distance required forinserting and withdrawing the wire.

Moreover should it be desired to insert and withdraw the pile wire atvarying speeds and also obtain a dwell at each end of the movement theepicyclic driving arm instead of being secured to the driving shaft maybe loosely mounted thereon and driven therefrom at varying speeds by acam or by eccentric or elliptical driving wheels.

One mechanism for giving a variable rotary speed to the epicyclicdriving arm about the shaft consists of an arm keyed on to the drivingshaft and carrying a two armed lever pivotally mounted thereon. One endof this lever carries a pin and the other end carries an antifrictionroller. An arm is secured to the sleeve loose on the driving shaft towhich the epicyclic driving arm is afiixed and the arm secured to thesleeve is formed with a radial slot in which the pin of the two armedlever is located. A fixed cam surrounds the driving shaft in the path ofthe anti-friction roller whereby as the arm keyed to the driving shaftrotates with the shaft the two armed lever is oscillated by the cam andconsequently the pin moves in the slot of the arm secured to the sleeveso that the latter whilst making one revolution for each revolution ofthe shaft moves at varying angular speeds during each revolution andsince the arm is secure to the sleeve to which the epicyclic driving armis affixed, the latter arm will also rotate at varying angular speedsalthough making one revolution for each revolution of the shaft. Shouldit be desired to alter the varying angular speeds of the epicyclicdriving arm it is only necessary to replace the fixed cam by another.cam of a different contour.

What I claim is:

1. Means for the insertion and withdrawal of pile wires in looms havinga frame and a pile wire carrying slide mounted thereon for Weaving pilefabrics, comprising the combination with a constantly rotating shaft ofthe loom of an epicyclic driving arm mounted thereon, a short shaftrotatably mounted at one end of the epicyclic driving arm, a sprocketWheel carried on the short shaft, a stationary sprocket wheel carried bythe frame in alignment with the first sprocket wheel and coaxial withthe axis of rotation of the epicyclic driving arm, a chain connectingthe two sprocket wheels, a driven arm secured on the short shaft, twopulleys mounted on the free end of the driven arm, a cord passing aroundone of said pulleys and being secured at one end to a stationary part ofthe loom and at the other end to the said slide for imparting movementthereto in one direction, a series of fixed guide pulleys around whichsaid cord passes, a second cord passing around the other of said twopulleys and secured at one end to a stationary part of the loom and atthe other end to said slide for imparting movement to said slide in theother direction, and a second series of fixed guide pulleys around whichthe second cord passes, the ratio of the gearing between the twosprocket wheels being such that as the epicyclic arm rotates, the freeend of the driven arm and consequently the pulleys thereon areconstrained to move with a straight line movement.

2. In a loom having a frame, a pile wire carrying member slidablymounted on said frame and a continuously driven power shaft, means forsmoothly reciprocating said slide at high speed comprising an epicyclicarm fixed on said shaft, a driven arm pivoted at one end on saidepicyclic arm about an axis parallel to said shaft and having a pulleyassembly rotatably mounted on its other free end, a stationary sprocketmounted on the frame coaxial with the power shaft a second rotatablesprocket mounted on the pivot axis of said driven arm to move with saiddriven arm about that pivot axis, a chain interconnecting saidsprockets, and a system of cords and directional pulleys connectedbetween the pulley assembly on said driven arm and said member, thesprockets being of such relative diameter and drive ratio that rotationof said power shaft produces straight line reciprocation of the pulleyassembly on said other end of said driven arm in a plane perpendicularto the axis of said power shaft and said straight line motion isdirectly transmitted from said pulley assembly through said system tocorrespondingly reciprocate said member.

References Cited in the file of this patent UNITED STATES PATENTS776,375 Beattie et a1 Nov, 29, 1904 1,771,662 Stone July 29, 1930FOREIGN PATENTS 430,688 Great Britain June 24, 1935 539,700 GreatBritain Sept. 22, 1941 608,356 Germany Jan. 22, 1935

